Image Gallery: Top 12 Firefox Add-Ons

There are thousands of Firefox add-ons. Did we test them all? Nope! But, these 12 are the ones you need to make the most of your Web browsing.

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There are plenty of social ways to surf the Web, but none are quite as much fun as StumbleUpon. Use the StumbleUpon add-on to find, rate, and share Web pages. StumbleUpon does personalization right by involving people in the process.